Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95ca7f318cb488e…

MALICIOUS

PDF

72.9 KB Created: 2020-12-21 09:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1adedef6c497766acfece6b2f1a0e4a1 SHA-1: 9570d1d5c6182f2fb605b341fb70c5a1957184e2 SHA-256: b95ca7f318cb488e3e8af0a186fc49e4c6dd9658264ac3869b51b563be949236
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a seed-phrase/secret-recovery lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffine.ru/123?utm_term=plural+of+donkey PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f99619c4eda1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fb5f2eecb034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_5f9cce5ba16fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_5fa08c83822fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_5fb44ab2abf33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_5f968c5fc49db.pdfIn PDF document text
    • https://nokatumevizo.weebly.com/uploads/1/3/2/7/132740479/241963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5fd77476e76b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/47a18b9f-2b8b-4419-b252-829d167c6fd7/manual_for_vtech_cs6949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a56fc57-dc2c-4388-bc07-b3f1774bc0ca/7850975371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5daa9940-c8b8-4da6-b0dd-122ad43e342d/41768783222.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/17482553184.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/80578855198.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 4644 bytes
SHA-256: 497775fce536fcc93b6db91667d6924b964b8169c9cc165d1a0c8efc04625f72
font_01_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 12084 bytes
SHA-256: ddfb9e67d2be21450bfb4909ca8ab798d8ac78651752c7cd3d2db3af6e065bfa
font_02_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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